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Stelling, G.S. (author), Kester, J.A.T.M. van (author), Hulsen, L.J.M. (author) report 1994
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Jong, P. de (author) report 1994
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Jong, P. de (author) report 1993
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Stelling, G.S. (author), Boogaard, H.F.P. van den (author) report 1993
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Kernkamp, H.W.J (author), Kaaij, T. van der (author) report 1993
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Groot, S. (author) report 1979
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report 1977
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Zegers, E.B. (author) report 1970
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Wiggers, J.B.M. (author) report 1970